Milk-can ventilator.



No. 642,250. Patented Jan. 30, I900. M. H. NERBOVIG.

MILK CAN VENTILATDR.

(Application filed Aug. 15, 1899.) (No Model.)

ilwrrnio STATES PATENT rFIcE.

lliATlllAS H. NERBOVIG, OF NORSELAND, MINNESOTA.

lVllLK-CAN VENTILATOR.

SPECIFICATION forming part of Letters Patent N 0. 642,250, dated January 30, 1900.

Application filed August 15, 1899. Serial No. 727,309. (No model.)

To aZZ whom, it may concern.-

lie it known that I, MATrIIAs H. NERBOVIG, a citizen of the United States, residing at Norseland, in the countyot Nicollet and State of Minnesota, have invented a new and useful Milli-Can Ventilator, of which the following is a specification.

This invention relates to ventilators for milk-cans, and has special reference to a ventilating-cover, and the intention and purpose is to produce a ventilating milk-can'cover which will afford by the arrangement and combination of its several parts sufficient opportunityat all times for the escape of anyim pure air, animal heat, or offensive odors which may exist, especially in fresh milk, while confined for the purposes of transportation or otherwise, and also for supplying to the interior of the can a current of pure air without exposing the milk to injury from dust, rain, or other foreign substances.

With these and other objects and advantages in view the invention consists of the construction and arrangements of the several parts, which will be more fully hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a perspective view of a milk-can cover embodying the invention. Fig. 2 is a transverse vertical section of the same.

Similar numerals of reference are employed to indicate corresponding parts in both views.

The numeral 1 designates a milk-can cover,

which in general construction and arrangement is similar to ordinary devices of this character and made to snugly fit the neck of a milk-can. Instead of the usual central grip or handle the present form of cover is supplied with opposite grips or handles 2 and at the center is formed a vertical opening 3, which is walled by a depending flange 4, continuous with or connected to the top 5. At regular intervals the wall 4 will have enlarged openings 6 formed therein and covered with interiorly-located screens 7, of wire-gauze or other suitable material. The main cover 1 as thus constructed is intended to remain in the illllk'Gitll, and for ventilating purposes a supplemental cover 8 is adjustably and re movably fitted in the opening 3. This supplemental cover comprises a cylinder 9, which is longer than the flange 4 and has thereover a cap-plate 10, which is arched and flanged, as at 11, to bear against the top 5 at a distance from the opening 3. To the cap-plate 10 a grip or loop 12 is secured to facilitate the removal or adjustment of the said supplemental cover. At regular intervals Within the cylinder 9 enlarged openings 13 are out and have thereover wire-gauze screens 14, which are applied interiorly and between the said openings 13. Groups of punctures 15 are formed which materially assist in the admission of air and are of such small dimension as to obstruct the entrance of particles of matter from the exterior. The cylinder 9 also has at diametrically opposite points therein elongated vertically-disposed slots 16, and adjacent to and above the said slots 16 the upper ends 17 of yielding-arms 18 are firmly attached to the said cylinder 9, the said arms having intermediate outwardly-bowed portions 19, which normally project through the slots beyond the outer plane of the said cylinder. The lower ends 20 of the said arms extend below the adjacent terminals of the slots and limit the outward extent of the said bowed portions 19 of the arms. The arms 18 are of such resilient strength as to have considerable frictional contact with the flange 4 and support the supplemental cover in adjusted position and also hold it against loose movement when fully pressed inwardly into the cover 1. The openings 13 and punctures 15 in the cylinder 9 are disposed at such an elevation relatively to the bowed portions 19 of the arms 18 that the supplemental cover 10 can be held in elevated or adjusted position in the flange 4 and expose the said openings and punctures. Furthermore, the outwardly-bowed portions 19 of the arms 18 have continual bearing against the interior of the flange 4, and the supplemental cover can be drawn upwardly any extent and remain at an elevation without the manipulation of catches or analogous devices, and by this means an automatic retention of the said supplemental cover is obtained.

It will be observed that the wire-gauze screens 7 and 14 are so applied that the outer surface of the cylinder 9 and the inner surface of the flange 4will be free for close contact, and the flange of the cap-plate 10 extends far enough over the upper end of the cylinder 9 as not only to set up a positive closure with the top 5 of thecover 1, but also to serve as a partial shield when the supplemental cover 8 is elevated to prevent inwardsplashing of rain or water and also to some extent deflect extraneous floating substances or particles.

In the operation of the improved ventilating attachment the cover 8 is drawn upwardly to wholly or partially expose the openings 13 and punctures 15, and thereby permit the air to pass into the cylinder 9 and from the latter into the cam-body direct or through the gauze-covered openings 6. The amount of air admitted will depend upon the exposure of the ventilating openings and punctures and the arms 18 effectively operate to hold the cover 8 both in limited or extended adjustment.

In the manufacture of the improved device the cost will not be much in. excess of that ordinarily required for the usual form of can and cover, and especially when comparatively considered from the standpoint of advantage gained by ventilating the milk contained within the can or of permitting the ani'mal heat to escape.

This ventilating attachment could also be equally well used in connection with other kinds of containing-receptacles and for ventilating other fluids or materials. To accommodate certain applications it might be necessary to modify the device in certain particulars, and therefore changes in the form, proportions, and minordetails of construction can be resorted to without in the least departing from the spirit or sacrificing any of the advantages of the invention.

Having thus described the invention, what is claimed as new is- 1. The combination of a milk-can cover having an inwardly-projecting flange completely located Within and inclosed by the cover surrounding a central opening, said flange having screen-covered openings therethrough at intervals, a supplemental cover having a cylinder slidingly fitted in the said opening and provided with ventilating-openings and oppositely-disposed slots, a part of the openings in the said cylinder being adapted to register with the openings in the flange and spring-arms secured within the said cylinder and having intermediate portions extending outwardly through the slots for frictional engagement with the inner surface of the flange of the can-cover.

2. The combination of a milk-can cover,

.having an inwardly-extending flange completely inclosed Within the said cover and having openings therein at intervals, a supplemental cover having a cylinder with ventilating-openings therein adapted to register with the openings in the flange, and diametrically opposite slots and also provided with a cap-plate, with a portion extending beyond the upper extremity of the cylinder, yielding arms'held within the said cylinder and provided with outwardly-directed intermediate bowed portions projecting through the slots for frictional contact with the flange surrounding the central opening of the cancover, and means on the supplemental cover for raising and lowering the same.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature in the presence of two Witnesses.

MATI-IIAS H. NERBOVIG. 

